객관식
Rutherfordium has an atomic number of 104. How many protons and electrons does a neutral atom of rutherfordium contain?
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2. Atoms & Elements
The Atom
Multiple Choice
How many protons are present in an atom of aluminum (Al)?
A
27
B
14
C
12
D
13
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검증된 단계별 안내1
Recall that the number of protons in an atom is given by its atomic number, which is unique for each element.
Identify the element in question, which is aluminum (Al).
Look up the atomic number of aluminum on the periodic table; this number represents the number of protons.
Note that the atomic number of aluminum is 13, meaning every aluminum atom has 13 protons.
Understand that the mass number (such as 27 for aluminum) represents the total number of protons and neutrons, not just protons.
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